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Other Comprehensive Income/(Loss) (Tables) | 12 Months Ended
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May 31, 2012
Other Comprehensive Income/(Loss) [Abstract] |
Components of other comprehensive income/(loss) |
|  | Year ended May 31, |
In millions |  | 2012 |  |  | 2011 |  |  | 2010 |
Unrealized holding gains/(losses) |  | $ | 1.3 |  |  | $ | (6.0 | ) |  | $ | 3.1 |
Income tax (expense)/benefit related to unrealized holding gains/(losses) |  |  | (0.4 | ) |  |  | 1.9 |  |  |  | (0.6 | )
Reclassification adjustment for the net gain on sale of available-for-sale securities realized in net income |  |  | (1.0 | ) |  |  | (1.3 | ) |  |  | (3.2 | )
Income tax expense on reclassification adjustment for the net gain on sale of available-for-sale securities |  |  | 0.3 |  |  |  | 0.5 |  |  |  | 1.2 |
Other comprehensive income/(loss) |  | $ | 0.2 |  |  | $ | (4.9 | ) |  | $ | 0.5 |

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